Whether it's worth it or not would depend on the panel. I've done several product tests, through several panels, but they were ususaly from survey companies like Pinecone Research, Global Opinion Panel, etc. You generally get paid for it, but usually not a lot. (though you also usually get to keep the product )
Your best bet is to check out the Surveys subforum in Freebies, where most of the product tests/panels are posted. Read through several of the threads, or even post your question there
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